Bar code is the line and blank in accordance with a certain coding rules of the symbol, to represent a certain number of letters, numbers and other information. In the identification of the time, is a barcode reader scanning, to obtain a set of reflected light signal, the signal by photoelectric conversion into a set of lines, blank corresponding to the electronic signal, after decoding to restore the corresponding text number, and then into the computer. Barcode identification technology has been quite mature, its reading error rate is about one out of 10,000, the first reading rate is greater than 98%, is a high reliability, fast input, high accuracy, low cost, widely used data collection technology.